CentOS系統更新失敗：dnf update error--

所報錯誤如下：

RPM: error: db5 error(-30969) from dbenv->open: BDB0091 DB_VERSION_MISMATCH: Database environment version mismatch
RPM: error: cannot open Packages index using db5 -  (-30969)
RPM: error: cannot open Packages database in /var/lib/rpm
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.

 

解決：刪除rpm管理數據庫，然后重建。步驟如下：

1、cd 到目錄“/var/lib/rpm”，確定數據庫列表和名稱：

root# cd /var/lib/rpm

root# ls -a

2、刪除“__db.001”、“__db.002”和“__db.003”：

root# rm -rf __db.*

 

3、重建：

root# rpm --rebuilddb

 

4、這樣就可以更新了：

root# dnf update